Serhiy Storchaka added the comment:

What would be the best solution for 2.7?

Here is a patch which forbids any group references in lookbehind assertions 
(they are not work currently and users shouldn't use them).

----------
stage:  -> patch review
Added file: 
http://bugs.python.org/file37326/re_forbid_groupref_in_lookbehind-2.7.patch

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<http://bugs.python.org/issue9179>
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